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And the Earth days themselves are slowing down, they had fewer hours a billion year ago.
The Moon is already tide-locked with one side watching the Earth. Eventually if the system could go on long enough (it won't, the sun will blast it all earlier), the Earth would also become tide-locked with the moon, with a day that last weeks and the Moon further from the Earth than it is now.
And anyway, it's only western women who have a 28 days cycle, found this looking for a ref. on wikipedia: http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=Retrieve&db=PubMed&list_uids=1340049&dopt=A bstractPlus Pierre
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